Patents by Inventor Narayanan Venkatasubramanian

Narayanan Venkatasubramanian has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8830214
    Abstract: A technique for managing image quality in a laser-based imaging system is provided. Laser light sources are organized into two or more groups, and optical output power of a light source group containing an under-performing laser is matched to that of the under-performing laser, while the optical output power of the light sources in the remaining groups is not. The output of the laser light sources in each group is interleaved with the output of the laser light sources in the other groups, so that perceptual uniformity of a displayed image is maintained when the display is viewed from an appropriate viewing distance.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: September 9, 2014
    Assignee: Prysm, Inc.
    Inventors: Amit Mahajan, Narayanan Venkatasubramanian
  • Patent number: 8788733
    Abstract: Embodiments of the present invention generally provide an interconnect between a data signal source and a display device. The interconnect may be used to transmit data signals, command data, and power from the data signal source to the display device. The interconnect also may be used to transmit feedback data from the display device to the data signal source.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: July 22, 2014
    Assignee: Prysm, Inc.
    Inventors: Narayanan Venkatasubramanian, Durga Venkata Prasad Sreeram
  • Publication number: 20120176347
    Abstract: A technique for managing image quality in a laser-based imaging system is provided. Laser light sources are organized into two or more groups, and optical output power of a light source group containing an under-performing laser is matched to that of the under-performing laser, while the optical output power of the light sources in the remaining groups is not. The output of the laser light sources in each group is interleaved with the output of the laser light sources in the other groups, so that perceptual uniformity of a displayed image is maintained when the display is viewed from an appropriate viewing distance.
    Type: Application
    Filed: April 29, 2011
    Publication date: July 12, 2012
    Inventors: Amit MAHAJAN, Narayanan Venkatasubramanian
  • Publication number: 20110267328
    Abstract: A tiled display system includes a plurality of display devices coupled together via a display device interconnect. Video signals and power can be transmitted to any display device coupled to the display device interconnect and then be distributed to the other display devices coupled to the display device interconnect. In situations where the power supply within a display device becomes inactive, the display device is capable of drawing power from neighboring display devices via the display device interconnect in order to power internal circuitry used to relay data signals.
    Type: Application
    Filed: December 29, 2010
    Publication date: November 3, 2011
    Inventors: Narayanan Venkatasubramanian, Durga Venkata Prasad Sreeram
  • Publication number: 20110267475
    Abstract: Embodiments of the present invention generally provide an interconnect between a data signal source and a display device. The interconnect may be used to transmit data signals, command data, and power from the data signal source to the display device. The interconnect also may be used to transmit feedback data from the display device to the data signal source.
    Type: Application
    Filed: December 29, 2010
    Publication date: November 3, 2011
    Inventors: Narayanan VENKATASUBRAMANIAN, Durga Venkata Prasad SREERAM
  • Patent number: 7862856
    Abstract: The present invention provides a method for making a polymer dielectric composition incorporating diamondoids or diamond-like hydrocarbon units. The method includes forming a polymer solution from the cardo-diol 9,9-bis(4-hydroxyphenyl)fluorene and a diacid chloride, casting a freestanding thin polyester film from the polymer solution, and metallizing the polyester film with an evaporated Al layer to form the dielectric composition. The diacid chloride may be derived from trans-1,4-cyclohexanedicarboxylic acid; 1,3-adamantanedicarboxylic acid; or 4,9-diamantanedicarboxylic acid.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: January 4, 2011
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Thuy D. Dang, Narayanan Venkatasubramanian, Sandra J. Fries-Carr, Kevin J. Wiacek
  • Patent number: 7208551
    Abstract: Polyaryleneetherketone triphenylphosphine oxide compositions incorporating cycloaliphatic units are provided which may be used as a polymeric binders in thermal control coatings for use in space environments. A method is also provided for synthesizing the polyaryleneetherketone triphenylphosphine oxide compositions. A method is also provided for synthesizing the monomeric compositions used to make the polyaryleneetherketone triphenylphosphine oxide compositions.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: April 24, 2007
    Assignee: University of Dayton
    Inventors: Thuy D. Dang, Matthew J. Dalton, Narayanan Venkatasubramanian, Joel A. Johnson, William A. Feld
  • Patent number: 7041779
    Abstract: A benzobisazole polymer having repeating units of the formula: wherein Q is and wherein Z is —O—, —S— or —NH—. A new method for preparing 1,5-naphthalenedicarboxylic acid from 1,5-diaminonaphthalene under relatively mild conditions in good yields is also described.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: May 9, 2006
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Thuy D. Dang, Narayanan Venkatasubramanian, Jar-Wha Lee, Soo-Young Park, Fred E. Arnold, Barry L. Farmer
  • Publication number: 20050043449
    Abstract: Polyaryleneetherketone triphenylphosphine oxide compositions incorporating cycloaliphatic units are provided which may be used as a polymeric binders in thermal control coatings for use in space environments. A method is also provided for synthesizing the polyaryleneetherketone triphenylphosphine oxide compositions. A method is also provided for synthesizing the monomeric compositions used to make the polyaryleneetherketone triphenylphosphine oxide compositions.
    Type: Application
    Filed: August 18, 2004
    Publication date: February 24, 2005
    Inventors: Thuy Dang, Matthew Dalton, Narayanan Venkatasubramanian, Joel Johnson, William Feld
  • Patent number: 6392009
    Abstract: Benzobisazole polymers having repeating units of the formula wherein Z is wherein X is —S—, —O— or —NH—.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: May 21, 2002
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Fred E. Arnold, Thuy D. Dang, Narayanan Venkatasubramanian
  • Patent number: 6025439
    Abstract: Molecular dispersions of rigid-rod polybenzobisazole polymer/copolymer in thermoplastic matrices in a weight ratio of about 1:99 to 50:50 are prepared by dissolving the rigid-rod polymer in an alcoholic or aprotic solvent, dissolving the thermoplastic polymer in an alcoholic or aprotic solvent, combining the two solutions and recovering the resulting molecular composite from the combined solution. These molecular dispersions consist essentially of rigid-rod polybenzobisazole polymer/copolymer having sulfonic acid groups pendant to the polymer/copolymer backbone and thermoplastic polymers selected from the group consisting of polyvinylpyridines, poly(arylene ether ketone)s with a pyridyl functionality, aromatic poly(pyridine ether)s and poly(pyridine ether sulfone) copolymers, and polyimides with a pyridyl functionality.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: February 15, 2000
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Fred E. Arnold, Narayanan Venkatasubramanian, Thuy D. Dang, Derrick R. Dean
  • Patent number: 5998550
    Abstract: Molecular dispersions of rigid-rod polybenzobisazole polymer/copolymer in thermosetting matrices in a weight ratio of about 1:99 to 50:50 are prepared by dissolving the rigid-rod polymer in an alcoholic or aprotic solvent, dissolving the thermosetting polymer in an alcoholic or aprotic solvent, combining the two solutions and recovering the resulting molecular composite from the combined solution. These molecular dispersions consist essentially of rigid-rod polybenzobisazole polymer/copolymer having sulfonic acid groups pendant to the polymer/copolymer backbone and thermosetting polymers selected from the group consisting of iminobis(N-propyl-2-phenylethynyl-phthalimide), N-ethyl-(2,6-di-benzocyclobutenoxy)benzylamine, iminobis(N-propylnadic imide) and difunctional benzoxazine monomers of the formula ##STR1## wherein X is a single bond, --CO-- or --C(CH.sub.3).sub.2 -- and Q is --CH.sub.3 or --C.sub.6 H.sub.5.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: December 7, 1999
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Fred E. Arnold, Narayanan Venkatasubramanian, Thuy D. Dang, Derrick R. Dean
  • Patent number: 5847032
    Abstract: An aryletherketone copolymer having repeating units of the formula: ##STR1## wherein the ratio m:n is in the range of 1:99 to 99:1; wherein Ar is selected from the group consisting of: ##STR2## and wherein Ar' is selected from the group consisting of ##STR3## wherein Q is --O--, --CH.sub.2 -- or --CO--, is useful in the dispersion of active NLO chromophores containing a basic functionality to form optically clear films.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: December 8, 1998
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Fred E. Arnold, Narayanan Venkatasubramanian
  • Patent number: 5837783
    Abstract: An aryletherketone polymer having repeating units of the formula: ##STR1## wherein Ar is selected from the group consisting of ##STR2## wherein Q is --O--, --CH.sub.2 -- or --CO--, is useful in the dispersion of active NLO chromophores containing a basic functionality to form optically clear films.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: November 17, 1998
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Fred E. Arnold, Narayanan Venkatasubramanian
  • Patent number: 5670651
    Abstract: Benzocyclobutene-terminated monomers of the formula ##STR1## wherein Ar is --SO.sub.2 --, --CO--, or ##STR2## are prepared by reacting a benzocyclobutene of the formula ##STR3## wherein R is --H or --SiMe.sub.3, with a difluorophenyl compound of the formula ##STR4## wherein Ar is as described previously, in the presence of a promoter. A mixture of the resins is obtained when potassium carbonate is employed as the promoter. The bis(benzocyclobutene)-terminated monomer is obtained when cesium fluoride is employed as the promoter.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: September 23, 1997
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Loon-Seng Tan, Narayanan Venkatasubramanian
  • Patent number: 5616765
    Abstract: 4-Hydroxybenzocyclobutene is prepared by the demethylation of 4-methoxybenzocyclobutene in the presence of aluminum iodide. A new compound 4-trimethylsiloxybenzocyclobutene is prepared by reacting 4-hydroxybenzocyclobutene with chlorotrimethylsilane.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: April 1, 1997
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Loon-Seng Tan, Narayanan Venkatasubramanian